<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>分组选择器</title>
    <style>
        p, span, div {
            font-size: 28px;
        }
    </style>
</head>
<body>
    <p>p标签</p>
    <span>span标签</span>
    <div>div标签</div>
</body>
</html>